Abstract
21%Cr ferritic stainless steel (SS) is prevailing as a substitution of TYPE304 because it does not contain Ni, expensive ingredient. In this study, 21%Cr SS and TYPE304 were exposed for 5 years at seashore area in Okinawa, and corrosion resistance of these steels was evaluated from appearances and the maximum pit depth expected by Gumbel distribution. As a result, the estimated maximum pit depth value of 21%Cr SS was less than that in TYPE304 with #800 and 2B surface, while it was equivalent with HL surface. Growth rate of maximum pit depth could be expressed by the equation of x=aT n , where x is maximum pit depth, T is time, a and n are constants, and n was estimated to 0.2 with any surface in both steels. Therefore, it could be predicted that 21%Cr SS could exhibit superior or even equivalent corrosion resistance to that in TYPE304 when exposed longer period.
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